Sifting litter box



FIG. 1 is a perspective view of a sifting litter box;

FIG. 2 is a perspective view of the sifting litter box of FIG. 1 showing environment;

FIG. 3 is a front view of sifting litter box of FIG. 1;

FIG. 4 is a back view of the sifting litter box of FIG. 1;

FIG. 5 is a left side view of the sifting litter box of FIG. 1;

FIG. 6 is a right side view of the sifting litter box of FIG. 1;

FIG. 7 is a top view of the sifting litter box of FIG. 1; and,

FIG. 8 is a bottom view of the sifting litter box of FIG. 1.

The broken lines depict environmental subject matter, are for illustrative purposes only, and form no part of the claimed design. 

CLAIM The ornamental design for a sifting litter box, as shown and described. 